Sierra, Silverado 2006-2007

Removal & Installation

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4.3L Engine



  1. Drain the radiator.
  2.  
  3. Remove or disconnect the following:

    Fan shroud
     
    Negative battery cable
     
    Drive belt(s)
     
    Alternator and other accessories, if necessary
     
    Fan, fan clutch and pulley
     
    Accessory brackets that might interfere with water pump removal
     
    Lower radiator hose from the water pump inlet
     
    Heater hose from the nipple on the pump
     
    Water pump assembly away from the timing cover

    Click image to see an enlarged view

    Fig. Exploded view of the water pump mounting-4.3L engines

     

  4.  

To install:

  1. Clean all old gasket material from the timing chain cover.
  2.  
  3. Install or connect the following:

    Pump assembly with a new gasket. Torque the bolts to 33 ft. lbs. (45 Nm).
     
    Hose between the water pump inlet and the pump
     
    Fan, fan clutch and pulley
     
    Alternator and other accessories, if necessary
     
    Drive belt(s)
     
    Upper radiator shroud
     

  4.  
  5. Refill the cooling system.
  6.  
  7. Connect the battery.
  8.  

4.8L, 5.3L, 6.0L & 6.2L Engines



  1. Remove or disconnect the following:

    Air outlet duct
     
    Coolant
     
    Inlet radiator hose from the water pump
     
    Upper fan shroud
     
    Cooling fan and clutch assembly
     
    Drive belt
     
    Radiator outlet hose from the coolant pump
     
    Surge tank hose
     
    Heater hose
     
    Water pump

    Click image to see an enlarged view

    Fig. Exploded view of the water pump assembly-4.8L, 5.3L, 6.0L and 6.2L engines

     

  2.  

To install:


NOTE
DO NOT use cooling system seal tabs (or similar compounds) unless otherwise instructed. The use of cooling system seal tabs (or similar compounds) may restrict coolant flow through the passages of the cooling system or the engine components. Restricted coolant flow may cause engine overheating and/or damage to the cooling system or the engine components/assembly.

  1. Install or connect the following:

    Water pump. Install the water pump bolts. Tighten the water pump bolts first pass to 11 ft. lbs. (15 Nm); tighten the bolts final pass to 22 ft. lbs. (30 Nm).
     
    Water pump drive belt pulley and bolts (if applicable). Tighten the pulley bolts first pass to 89 inch lbs. (10 Nm); tighten the bolts final pass to 18 ft. lbs. (25 Nm).
     
    Surge tank hose
     
    Heater hose
     
    Outlet radiator hose to the coolant pump
     
    Drive belt
     
    Cooling fan and clutch assembly
     
    Upper fan shroud
     
    Inlet radiator hose to the water pump
     
    Air inlet duct
     
    Coolant
     

  2.  

6.6L Engine



  1. Remove the left front fender wheelhouse inner panel.
  2.  
  3. Drain the coolant.
  4.  
  5. Remove or disconnect the following:

    Thermostat housing crossover
     
    Fan clutch
     
    Crankshaft balancer
     
    Water pump outlet pipe-to-water pump nuts
     
    Engine wiring harness retainer front the inner stud
     
    Water pump bolts, noting their locations as they are different lengths
     
    Water pump and gasket

    Click image to see an enlarged view

    Fig. Exploded view of the water pump assembly and related components-6.6L diesel engines

     

  6.  

To install:

  1. Lubricate the water pump O-ring with engine oil.
  2.  
  3. Install or connect the following:

    Water pump
     
    Water pump bolts and tighten to 18 ft. lbs. (25 Nm)
     
    Water pump-to-water pump outlet gasket
     
    Engine wiring harness retainer on the water pump outlet pipe inner stud
     
    Water pump-to-water pump outlet pipe nuts and tighten to 18 ft. lbs. (25 Nm)
     
    Thermostat housing crossover
     
    Crankshaft balancer
     
    Fan clutch
     

  4.  
  5. Fill the cooling system and install the left front fender wheelhouse inner panel.
  6.  

8.1L Engines



  1. Remove or disconnect the following:

    Coolant
     
    Drive belt
     
    Fan clutch
     
    Outlet hose clamp and hose
     

  2.  
  3. Reposition the bypass hose clamps at the water pump and water crossover

    Bypass hose
     
    Water pump bolt and pump. Discard the water pump gaskets.

    Click image to see an enlarged view

    Fig. Exploded view of the water pump assembly-8.1L engines

     

  4.  

To install:

  1. Install or connect the following:

    New water pump gaskets.
     
    Water pump and bolts. Tighten the water pump bolts 37 ft. lbs. (50 Nm).
     
    Bypass hose and clamps
     
    Outlet hose and clamp
     
    Fan clutch
     
    Drive belt
     
    Surge tank hose
     
    Heater hose
     
    Outlet radiator hose to the coolant pump
     
    Drive belt
     
    Cooling fan and clutch assembly
     
    Upper fan shroud
     
    Inlet radiator hose to the water pump
     
    Air inlet duct
     
    Coolant
     

  2.  

 
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